Create playbook

[alukach]

The project documentation should contain a playbook describing how to use the STAC Auth Proxy.

Some ideas:

• authenticated users can access transaction endpoints. Anonymous users have read-only access
• the collections in which a user is permitted to view is encoded as an array of IDs in the auth token
• the collections in which a user is permitted to view is returned from a DB lookup
• anonymous users cannot read items containing a private: true property. Authenticated users can read all records